66265660663 has 16 divisors (see below), whose sum is σ = 73445330880. Its totient is φ = 59467741696.

The previous prime is 66265660661. The next prime is 66265660693. The reversal of 66265660663 is 36606656266.

It is a cyclic number.

It is not a de Polignac number, because 66265660663 - 2¹ = 66265660661 is a prime.

It is a super-2 number, since 2×66265660663² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66265660663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66265660661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143368 + ... + 391261.

It is an arithmetic number, because the mean of its divisors is an integer number (4590333180).

Almost surely, 2^66265660663 is an apocalyptic number.

66265660663 is a deficient number, since it is larger than the sum of its proper divisors (7179670217).

66265660663 is a wasteful number, since it uses less digits than its factorization.

66265660663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534986.

The product of its (nonzero) digits is 8398080, while the sum is 52.

The spelling of 66265660663 in words is "sixty-six billion, two hundred sixty-five million, six hundred sixty thousand, six hundred sixty-three".